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arXiv 2008.02035math.OCcs.DS
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一致流约束下的鲁棒最小费用流问题

Robust Minimum Cost Flow Problem Under Consistent Flow Constraints

Christina Büsing, Arie M. C. A. Koster, Sabrina Schmitz

摘要:

一致流约束下的鲁棒最小费用流问题(RobMCF $\equiv$)是最小费用流(MCF)问题的一个新的推广.在RobMCF $\equiv$问题中,我们考虑了受不确定性影响的需求和供给。然而,对于所有需求实现,如果弧包含在给定的预定弧集合中,则我们要求弧上的流值需要相等。其目标是找到可行的流,满足相同的流量要求,同时最大限度地减少所有的需求实现之间的最大发生成本。在一个离散集的情况下,我们推导出结构的结果,指出与多项式时间可解的MCF问题的网络积分容量的差异。特别是,积分流定理Dantzig和Fulkerson不成立。为此,我们要求在整个文件中的积分流。通过对$(3,B2)$ -Sat问题的简化,证明了RobMCF $\equiv$问题在无圈有向图上是强$\mathcal{NP}$ -困难的.此外,我们证明了RobMCF $\equiv$问题是弱$\mathcal{NP}$ -硬的串-并行有向图,通过提供减少从分区和伪多项式算法的基础上动态规划。最后,我们提出了一个特殊的情况下,串并行有向图,我们可以解决的RobMCF $\equiv$问题在多项式时间。

英文摘要:

The robust minimum cost flow problem under consistent flow constraints (RobMCF$\equiv$) is a new extension of the minimum cost flow (MCF) problem. In the RobMCF$\equiv$ problem, we consider demand and supply that are subject to uncertainty. For all demand realizations, however, we require that the flow value on an arc needs to be equal if it is included in the predetermined arc set given. The objective is to find feasible flows that satisfy the equal flow requirements while minimizing the maximum occurring cost among all demand realizations. In the case of a discrete set of scenarios, we derive structural results which point out the differences with the polynomial time solvable MCF problem on networks with integral capacities. In particular, the Integral Flow Theorem of Dantzig and Fulkerson does not hold. For this reason, we require integral flows in the entire paper. We show that the RobMCF$\equiv$ problem is strongly $\mathcal{NP}$-hard on acyclic digraphs by a reduction from the $(3,B2)$-Sat problem. Further, we demonstrate that the RobMCF$\equiv$ problem is weakly $\mathcal{NP}$-hard on series-parallel digraphs by providing a reduction from Partition and a pseudo-polynomial algorithm based on dynamic programming. Finally, we propose a special case on series-parallel digraphs for which we can solve the RobMCF$\equiv$ problem in polynomial time.

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